Spark plug



Jan. 8 1924. 1,480,092

R. E. MEYER SPARK PLUG Filed Oct. 1920 Patented Jan. 8, 1924.

UNITED STATES RAYMOND E. MEYER, F SYRACUSE, NEW YORK.

SPARK PLUG.

Application filed October 8, 1920.

T0 aZZ whomit may concern:

Be it known that I, RAYMOND E. MEYER, of Syracuse, in the county of ()nondaga,.in the State of New York, have invented new and useful Improvements in Spark Plugs, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in spark plugs as used more particularly for ignition purposes in internal combustion engines. I

The main object is to increase the strength, durability and working efiiciency and, at the same time, reduce the liability of short cir cuiting due to accumulations of carbon at the joints between the insulator and its support.

One of the specific objects is to seat the ends of the insulating sleeve in annular grooves in the clamping head and collar to prevent expansion or mutilation thereof when tightening and releasing the insulator disks upon and from the support.

Another specific object is to enable the laminated disks to be adjusted along and upon the sleeve and to be compressed more firmly by the clamping head and collar to increase the degree of insulation, if neces- 9 sar (d ther objects and uses relating to specific parts of the spark plug will be brought out in' the following description.

In the drawings:

Figures 1 and 2 are vertical sectional views of modified forms of my invention.

Figure 3 shows erspective views of the detached insulator s eeve and insulator disks.

Figure 4 is a perspective view of the'detached conductor having a clamping head and one of the spark terminals shown in Fig. 1.

igures 5, 6 and 7 are transverse sectional views take-n respectively on lines XX, Fig 1, Y-Y, Fig. 2, 2 and ZZ, Fig. 1.

Figure 8 is a perspective view of the lengthwise conductor having the clamping head and spark terminal shownin Figure 2. In Figure l, I have shown a spark plug 0 consisting of an insulator support --1 having a central lengthwise bore .2- for receiving an insulating sleeve -3-- which is extended through and beyond the opposite ends of the bore for receiving a pair of in- 66 sulator disks 4 and -5.

Serial No. 415,819.

The support 1 comprises a main body and a bushing 7-, the main body being provided with a reduced externally threaded inner end --8 adapted to be screwed into an internally threaded openmg 9 of an internal combustion engine 10- and forming a shoulder 11- for engaging a packing -]2-- and preventing leakage of the gases at the joint.

The bushing or follower 7- is screwed tightly into the outer end of the section -6 and against a suitable packing 12' to prevent leakage at the joint, the inner end of said bushing being of considerably less diameter than the interior diameter of the larger part of the section 6--, and of substantially the same diameter as that of the inner disk 4.- to form a chamber 13 extending upwardly'beyond the lower end face of the reduced portion, as --14, so that any carbon which may tend to accumulate in the chamber will impinge against the upper end wall, as --15 of said chamher some distance above the insulator -4 where the tendency to short circuit between the lamina of the insulator will be reduced to a minimum.

An electric conducting spindle --16 extends through and beyond the opposite ends of the insulator sleeve 3 and is provided at its inner end with a head 17- having an annular groove --18 forreceiving the inner or adjacent end of the sleeve, said head being engaged with the inner face of the disk --1 to clamp the same firmly against the reduced inner end of the bushingT-7.

his head -17 is provided with a reduced extension 19- forming a spark terminal which projects inwardly' beyond the inner end of the reduced portion ---8-- of the section 6 to cooperate with a companion spark terminal --19- on the inner end of the section -6 for igniting the explosive mixture of the engine when energized.

A collar -20 loosely surrounds the outer end of the spindle -16 and is engaged with the outer face of the outer insulator disk 5- to firmly clamp the same against the outer face/of the support -1, or rather bushing 7, said spindle having its outer end threaded and engaged by one or more nuts 21- for tightening and releasing the collar upon and from the disk, and also for establishing an electrical connection with a suitable conductor -22- with one side of the ignition circuit, the other side of said circuit being grounded on the frame of the engine which is in electrical connection with the terminal 19. The laminated sleeve 3 is preferably made of layers of mica wrapped or rolled one upon the other to form a sufficient thickness of insulation to prevent any possibility of short circuit between the conductor 16- and support 1-.

The laminated disks 4 and -.5 are also made up of layers of mica firmly clamped together by the head 17 and collar 20-, which are relatively adjustable endwise by mean-s of the nuts -21 to compress the disks firmly against the adjacent ends of the bushing 7.

In Figure 2, the insulator support is preferably made in one piece consisting of a bushing -2- which, however, is eccentric to the axis of the bushing, this, in orderthat the conducting spindle, as 16 may be odset a suiiicient distance to one side of said axis to permit the use of a straight upright terminal -Q3- on the inner end of the bushing a sufiicient distance from the head, as 17 of the conductor to reduce the possibility of short circuits between said terminal and conductor.

The inner end as '14: of the bushing 7' is reduced in diameter concentric with the axis of the bore 2 and forms a shoulder 15 some distance above the end face of the reduced portion -14: to keep the carbon which may tend to deposit thereon away from the inner insulator disk as 4. The head 17- like the head 17- 'is secured to the conductor -l6'- and is provided with an annular groove -18 in its upper face for receiving the adjacent end of the insulator sleeve -3 said head being also provided with a radially projecting terminal 24 to cooper- --7 having a lengthwise bore.

terminal secured to and projecting inwardly from the inner end of the bushing at the opposite side of said axis and in spaced relation to the reduced extension, an insulator sleeve extending through the bore, a conductor extending through the sleeve, a head secured to the inner end of the conductor and provided with a spark terminal coop crating with the first named terminalforv ignition purposes, said head having an 'annular groove for receiving the inner end of the sleeve, an insulator disk adjustable lengthwise of and upon the inner end of the sleeve between the head and reduced end of the bushing, a collar loosely surrounding the outer end of the conductor and provided with an annular groove for receiving the outer end of the sleeve, an insulator disk adjustable lengthwise of and upon the outer end of the sleeve between said collar and outer end of the bushing, and means for adjusting the collar and conductor axially relatively to each other for tightening the disks in place, one of said grooves being of sutficient axial depth to allow its end wall to clear. the adjacent end of the sleeve when the disks are tightened against the adjacent ends of the bushing.

In witness whereof I 'have' hereunto set my hand this 1st day of October, 1920.

RAYMOND E. MEYER.

Witnesses:

H. E. CHASE, Ross G. CARROLL. 

